Cancels payment request when Settings is tapped, and opens the Autofill settings page.

ios/chrome/browser/payments/payment_request_manager.mm

Index: ios/chrome/browser/payments/payment_request_manager.mm
diff --git a/ios/chrome/browser/payments/payment_request_manager.mm b/ios/chrome/browser/payments/payment_request_manager.mm
index 56fbab0920d246eafb29f94aee59d5d5677583bf..d7cf6e5620c77f68276f495f9593c9712eec73c6 100644
--- a/ios/chrome/browser/payments/payment_request_manager.mm
+++ b/ios/chrome/browser/payments/payment_request_manager.mm
@@ -8,6 +8,7 @@
 #include "base/ios/ios_util.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "base/values.h"
@@ -21,6 +22,9 @@
 #include "ios/chrome/browser/payments/payment_request.h"
 #import "ios/chrome/browser/payments/payment_request_coordinator.h"
 #include "ios/chrome/browser/procedural_block_types.h"
+#import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
+#import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
+#import "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/navigation_manager.h"
@@ -539,6 +543,18 @@ const NSTimeInterval kTimeoutInterval = 60.0;
                                 callback:nil];
 }
 
+- (void)paymentRequestCoordinatorDidSelectSettings:
+    (PaymentRequestCoordinator*)coordinator {
+  [self terminateRequestWithErrorMessage:@"The payment request was canceled."

[Moe, 2017/04/06 05:18:13]

While you're at it, please refactor these messages into constants. e.g.,
kAbortMessage, kCancelMessage, etc.

[macourteau, 2017/04/06 14:21:22]

Done.

+                                callback:nil];

[Moe, 2017/04/06 05:18:13]

Could you do the following logic in a callback that you pass to this method?
that way we know the JS has executed? I believe you'd need a
ProceduralBlockWithBool. There are other examples in this file.

[macourteau, 2017/04/06 14:21:22]

Done.

+
+  UIWindow* main_window = [[UIApplication sharedApplication] keyWindow];

[Moe, 2017/04/06 05:18:13]

nit: mainWindow

[macourteau, 2017/04/06 14:21:22]

Done.

+  DCHECK(main_window);
+  base::scoped_nsobject<GenericChromeCommand> command(

[Moe, 2017/04/06 05:18:13]

I believe you don't need a base::scoped_nsobject when ARC is enabled. A
GenericChromeCommand* does it.

[macourteau, 2017/04/06 14:21:22]

Done.

+      [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_AUTOFILL_SETTINGS]);
+  [main_window chromeExecuteCommand:command];
+}
+
 - (void)paymentRequestCoordinator:(PaymentRequestCoordinator*)coordinator
     didConfirmWithPaymentResponse:(web::PaymentResponse)paymentResponse {
   [_paymentRequestJsManager